OpenAI Releases GPT-5.4 Mini and Nano for Faster, Cheaper AI Workloads

OpenAI Releases GPT-5.4 Mini and Nano for Faster, Cheaper AI Workloads

OpenAI released GPT-5.4 mini and nano on March 18, 2026, targeting developers who need strong model performance at lower cost and higher speed.

GPT-5.4 Mini Specs

GPT-5.4 mini delivers core capabilities of the full GPT-5.4 model with 2x faster performance. It supports a 400,000-token context window and 128,000-token maximum output. Pricing is $0.75 per million input tokens and $4.50 per million output tokens.

The model shows strong results in coding, reasoning, and tool use, approaching full GPT-5.4 performance on benchmarks like SWE-Bench Pro and OSWorld-Verified.

Availability

Both models are available through the OpenAI API and on OpenRouter. They are designed for chat applications, coding assistants, and agent workflows at scale where cost efficiency matters as much as capability.